Contingencies Schedule of FCPA Expenses (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
|
| Foreign Corrupt Practices Act Expenses [Line Items] | ||
| Foreign corrupt practices act related expenses | $ 4 | $ 7 |
| Inquiry and investigation expense | ||
| Foreign Corrupt Practices Act Expenses [Line Items] | ||
| Foreign corrupt practices act related expenses | 2 | 4 |
| Compliance programs and organizational enhancements | ||
| Foreign Corrupt Practices Act Expenses [Line Items] | ||
| Foreign corrupt practices act related expenses | $ 2 | $ 3 |